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Page 29
Air Evacuation
7
Preparations and Precautions
Air and foreign matter in the refrigerant circuit
can cause abnormal spikes in pressure, which
can damage the air conditioner, reduce its
efficiency, and cause injury. Use a vacuum pump
and manifold gauge to evacuate the line sets
circuit, removing any non-condensable gas and
moisture from the system.
Evacuation should be performed upon initial
installation or when the unit is relocated.
BEFORE PERFORMING EVACUATION
Check to make sure that both LIQUID
SIDE and GAS SIDE pipes between
the indoor and outdoor units are
connected properly in accordance with the
“Refrigerant Piping Connection” section of
this manual.
Check to make sure all wiring is connected
properly.
Evacuation Instructions
Before using the manifold gauge and vacuum
pump, read their operation manuals to familiarize
yourself with how to use them properly.
Manifold Gauge
Low pressure gauge
-76cmHg
Low pressure valve
High pressure
valve
Blue (low)hose
Yellow (middle) hose
Vacuum
pump
High pressure gauge
1.
2.
Connect yellow (middle) hose from the
manifold gauge to the vacuum pump.
MC MC
Fig. 6.1
Air Evacuation
BLUE (Low Pressure) Gauge RED (High Pressure) Gauge
BLUE (Low Pressure) Side of Manifold Gauge RED (High Pressure) Side of Manifold Gauge
Low Pressure Valve High Pressure Valve
YELLOW (Common) Side of Manifold Gauge
LARGE DIA (GAS)
Service Valve
SMALL DIA (LIQUID)
Service Valve
Outdoor Unit Service Valve Set (GAS and LIQUID Valves)
Connect the blue (low side) hose of the manifold
gauge to service port on the outdoor unit’s
GAS SIDE valve (use a 1/4” to 5/16”port adapter if
needed, which is sold separately)
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